Statement Of Cash Flows [Abstract]
| Concept |
As at 2022-12-31 |
2022-01-01 to 2022-12-31 |
As at 2021-12-31 |
2021-01-01 to 2021-12-31 |
2020-01-01 to 2020-12-31 |
|---|---|---|---|---|---|
| Statement of cash flows [abstract] | |||||
| Cash flows from (used in) operating activities [abstract] | |||||
| Cash flows from (used in) operations | — |
716,000,000
GBP
|
— |
669,000,000
GBP
|
653,000,000
GBP
|
| Interest paid, classified as operating activities | — |
52,000,000
GBP
|
— |
42,000,000
GBP
|
49,000,000
GBP
|
| Interest received, classified as operating activities | — |
13,000,000
GBP
|
— |
5,000,000
GBP
|
8,000,000
GBP
|
| Income taxes paid (refund), classified as operating activities | — |
77,000,000
GBP
|
— |
69,000,000
GBP
|
64,000,000
GBP
|
| Cash flows from (used in) operating activities | — |
600,000,000
GBP
|
— |
563,000,000
GBP
|
548,000,000
GBP
|
| Cash flows from (used in) investing activities [abstract] | |||||
| Cash flows from losing control of subsidiaries or other businesses, classified as investing activities | — |
1,000,000
GBP
|
— |
–
GBP
|
2,000,000
GBP
|
| Cash flows used in obtaining control of subsidiaries or other businesses, classified as investing activities | — |
1,018,000,000
GBP
|
— |
463,000,000
GBP
|
194,000,000
GBP
|
| Proceeds from sales of property, plant and equipment, classified as investing activities | — |
5,000,000
GBP
|
— |
7,000,000
GBP
|
6,000,000
GBP
|
| Purchase of property, plant and equipment, classified as investing activities | — |
153,000,000
GBP
|
— |
128,000,000
GBP
|
130,000,000
GBP
|
| Purchase of intangible assets, classified as investing activities | — |
37,000,000
GBP
|
— |
32,000,000
GBP
|
23,000,000
GBP
|
| Cash flows from (used in) investing activities | — |
1,197,000,000
GBP
|
— |
441,000,000
GBP
|
497,000,000
GBP
|
| Cash flows from (used in) financing activities [abstract] | |||||
| Payments from changes in ownership interests in subsidiaries that do not result in loss of control | — |
–
GBP
|
— |
9,000,000
GBP
|
–
GBP
|
| Proceeds from borrowings, classified as financing activities | — |
2,383,000,000
GBP
|
— |
5,000,000
GBP
|
1,690,000,000
GBP
|
| Repayments of borrowings, classified as financing activities | — |
844,000,000
GBP
|
— |
167,000,000
GBP
|
1,352,000,000
GBP
|
| Payments of lease liabilities, classified as financing activities | — |
104,000,000
GBP
|
— |
88,000,000
GBP
|
85,000,000
GBP
|
| Dividends paid, classified as financing activities | — |
122,000,000
GBP
|
— |
139,000,000
GBP
|
–
GBP
|
| Cash flows from (used in) financing activities | — |
1,323,000,000
GBP
|
— |
417,000,000
GBP
|
229,000,000
GBP
|
| Increase (decrease) in cash and cash equivalents before effect of exchange rate changes | — |
726,000,000
GBP
|
— |
295,000,000
GBP
|
280,000,000
GBP
|
| Effect of exchange rate changes on cash and cash equivalents [abstract] | |||||
| Effect of exchange rate changes on cash and cash equivalents | — |
89,000,000
GBP
|
— |
14,000,000
GBP
|
3,000,000
GBP
|
| Cash and cash equivalents |
2,170,000,000
GBP
|
— |
668,000,000
GBP
|
— | — |